peg someone down—
1. force a person to keep to a decision, agreement, etc.:
- One can’t peg him down to one genre of music because each CD can span several genres.
2. have a fixed opinion of a person:
- She had already pegged him down as a lazy, boozing, drug-taking, and altogether irresponsible man.
take someone down a peg —(also: take someone down a peg or two) make smb. feel less important; snub or humiliate a person:
- The most influential paper picked the moment of his greatest triumph to take him down a peg.